I suspect the prejudice towards using corn sugar instead of table sugar dates back to the early days of homebrewing in the 1970s and 1980s where the standard homebrew recipe consisted of mixing a 3.3 lb. can of Muntons & Fison's liquid malt extract with 2 lbs. of table sugar. Homebrewers would complain that resultant beer tasted cidery, whereas if you brewed with 2 can of M&F LME and omitted the table sugar, the beer tasted much better. So table sugar was blamed for causing cider tastes in beer, when the real culprit was just using too much sugar of any kind.